A quick question I’ve been meaning to ask for some time…
Besides in the case of the reassignment of -ῑτης (third declension -ες) adjectives to an α-stem nominal (ie first) declension (eg the nominal ὁπλίτης → ὁπλῖται) are there any other (native) first declension nouns with properispomenal nominatives plural?
Appreciated. 
I might be missing the point here… you mean any nouns of the first declension? Like νῖκαι, χῶραι, γλῶτται, σφαῖραι…?
I suspect that the question is referring specifically to words of more than two syllables with a long penult. But it’s still a good chunk of them that will get the circumflex in nominative plural. ἑκηβόλος could glance through Chandler chapter 2 and look for “paroxytone.”